1. Install Java
If you have already installed Java then skip to point 3.
Before continue make sure you don’t have installed Java.
Open terminal and invoke:
whereis java
command. If you do not have Java then you will see:
java:
That will mean you DONT have Java.
Download Java from here or use your package manager to install it.
2. Java location
By default Java is located in
/usr/lib/jvm/java-
directory.
3. Set $JAVA_HOME variable
To set JAVA_HOME only in actual shell session, invoke command:
export JAVA_HOME=/usr/lib/jvm/java-
To persist this environment variable edit vi ~/.bash_profile file, and add JAVA_HOME definition:
JAVA_HOME=/usr/lib/jvm/java-
Save and relogin to apply changes.